Mercurial > flash_v2
diff packages/devs/flash/arm/at91/current/src/flash_query.c @ 175:e7780801e1a7
Merge from eCos master repository on 2001-07-31-19:15:01-BST
| author | jlarmour |
|---|---|
| date | Tue, 31 Jul 2001 21:15:36 +0000 |
| parents | |
| children | e0c0827131d1 |
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new file mode 100644 --- /dev/null +++ b/packages/devs/flash/arm/at91/current/src/flash_query.c @@ -0,0 +1,100 @@ +//========================================================================== +// +// flash_query.c +// +// Flash programming - query device +// +//========================================================================== +//####COPYRIGHTBEGIN#### +// +// ------------------------------------------- +// The contents of this file are subject to the Red Hat eCos Public License +// Version 1.1 (the "License"); you may not use this file except in +// compliance with the License. You may obtain a copy of the License at +// http://www.redhat.com/ +// +// Software distributed under the License is distributed on an "AS IS" +// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the +// License for the specific language governing rights and limitations under +// the License. +// +// The Original Code is eCos - Embedded Configurable Operating System, +// released September 30, 1998. +// +// The Initial Developer of the Original Code is Red Hat. +// Portions created by Red Hat are +// Copyright (C) 1998, 1999, 2000, 2001 Red Hat, Inc. +// All Rights Reserved. +// ------------------------------------------- +// +//####COPYRIGHTEND#### +//========================================================================== +//#####DESCRIPTIONBEGIN#### +// +// Author(s): gthomas +// Contributors: gthomas +// Date: 2001-07-17 +// Purpose: +// Description: +// +//####DESCRIPTIONEND#### +// +//========================================================================== + +#include "flash.h" + +#include <pkgconf/hal.h> +#include <cyg/hal/hal_arch.h> +#include <cyg/hal/hal_cache.h> +#include CYGHWR_MEMORY_LAYOUT_H + +// +// CAUTION! This code must be copied to RAM before execution. Therefore, +// it must not contain any code which might be position dependent! +// + +#define CNT 2000*1000*10 // At least 20ms + +int +flash_query(unsigned short *data) +{ + volatile unsigned short *ROM; + int cnt, cache_on; + + HAL_DCACHE_IS_ENABLED(cache_on); + if (cache_on) { + HAL_DCACHE_SYNC(); + HAL_DCACHE_DISABLE(); + } + + ROM = (volatile unsigned short *)0x01010000; + + // Send lead-in sequence + ROM[FLASH_Key_Addr0] = FLASH_Key0; + ROM[FLASH_Key_Addr1] = FLASH_Key1; + + // Send 'identify' command + ROM[FLASH_Key_Addr0] = FLASH_Read_ID; + + // Need a delay of 20ms! + for (cnt = 0; cnt < 50000; cnt++) ; + + data[0] = ROM[0]; // Manufacturer code + data[1] = ROM[1]; // Device identifier + + // Send lead-in sequence + ROM[FLASH_Key_Addr0] = FLASH_Key0; + ROM[FLASH_Key_Addr1] = FLASH_Key1; + + // Send 'reset' command + ROM[FLASH_Key_Addr0] = FLASH_Reset; + + // Need a delay of 20ms! + for (cnt = 0; cnt < 50000; cnt++) ; + + if (cache_on) { + HAL_DCACHE_ENABLE(); + } + + return 0; +}
